1) On Maruyama-nishi site, recently found in Todaiji-temple, we collected roof edge tiles to research. As a result, roof tiles made for the primary building of Maruyama-nishi site were classified as early Kofukuji-temple types. So we estimated that a temple was founded at Maruyama in late 720's.2) On Maruyama-nishi site, we made a survey to make large-scale maps. We also investigated underground with radar and electrical systems, and succeeded in finding ruins clearly. We believe firmly that a big temple has been berried there.3) We researched Todaiji-temple documents to collect datum of Tenchiin-temple, Otomodera-temple and domains located near Todaiji-temple, and constructed a database. Consequently, we made it clear that at Maruyama existed a forest temple in Nara period, Shimakon'in-temple in Heian period, an unknown small temple in Kamakura period, rice paddy and forest in Edo period.4) We have come to conclusion that Kinshoji-temple was founded at Maruyama, Fukujuji-temple at Join block, and these two temples were unified into Konkomyoji-temple that subsequently developed to Todaiji-temple. Todaiji-temple must have been originally built as a forest temple by the organization inherited from Kofukuji-temple.